This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker ... (Read 107 times)

fnuegbu

  • Hero Member
  • *****
  • Posts: 539
on: Jun 25, 2018
A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker cells of the heart. Which of the following areas received the greatest damage?
 
  a. Atrioventricular (AV) node
  b. Sinoatrial (SA) node
  c. Bundle of His
  d. Ventricles

Question 2

A 28-year-old with seizure disorder has a vagus nerve stimulator implanted to help control sei-zure activity. Which result will the nurse expect to occur?
 
  a. Increased speed of cardiac cycle
  b. Increased cardiac contractility
  c. Decreased vasodilation
  d. Decreased cardiac conduction


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Dominic

  • Sr. Member
  • ****
  • Posts: 328
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
The SA node, not the AV node, is considered the pacemaker of the heart. Neither the bundle of His nor the ventricles are involved.

Answer to Question 2

ANS: D
The vagus nerve releases acetylcholine. Acetylcholine causes decreased heart rate and slows conduction through the AV node, thus decreasing the speed of the cardiac cycle. This reaction also decreases contractility but does not cause decreased vasodilation.


fnuegbu

  • Member
  • Posts: 539
Reply 2 on: Jun 25, 2018
Great answer, keep it coming :)

tuate

  • Member
  • Posts: 332
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

These photos show a rat burying a test object from which it has just received a single mild shock. These photos show a rat burying a test object from which it has just received a single mild shock.
Chest x-ray of lung cancer; cancer is seen on the left side. Chest x-ray of lung cancer; cancer is seen on the left side.
Auscultating the chest over five key landmarks Auscultating the chest over five key landmarks
Seven students have applied for merit scholarships. This year 3 merit scholarships were ... Seven students have applied for merit scholarships. This year 3 merit scholarships were ...
Dragon Chinese new year 2023 Dragon Chinese new year 2023
Kindergarten school year book Kindergarten school year book
Video: Pores and Ion Channels

For a complete list of videos, visit our video library